Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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MOOSE RACING Inner Clutch Cover Gasket 816281
MOOSE RACING
$16.37A failing clutch cover gasket compromises your engine's oil containment and invites costly leaks that can damage surrounding components. The MOOSE RACING Inner Clutch Cover Gasket delivers...09346138- SKU:
- 09346138
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$16.37 -
MOOSE RACING Inner Clutch Cover Gasket 816282
MOOSE RACING
$15.18A leaking clutch cover gasket compromises both performance and engine longevity—this OEM-spec replacement from Moose Racing seals critical contact points with precision-engineered materials that...09346139- SKU:
- 09346139
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$15.18 -
MOOSE RACING Inner Clutch Cover Gasket 816285
MOOSE RACING
$15.18A failing clutch cover gasket compromises engine sealing and invites costly oil leaks that can damage bearings and internal components. The MOOSE RACING Inner Clutch Cover Gasket delivers...09346140- SKU:
- 09346140
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$15.18 -
MOOSE RACING Valve Shim - 7.48 x 1.70 - 5 pack MSE5PK748170
MOOSE RACING
$10.95Precision valve shim selection is critical for maintaining proper valve clearance and engine performance across multiple heat cycles. These forged 4140 cold-rolled steel shims eliminate guesswork...09261868- SKU:
- 09261868
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.70 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.75 - 5 pack MSE5PK748175
MOOSE RACING
$10.95Proper valve clearance is critical to engine performance, fuel efficiency, and component longevity—and maintaining it requires the right shims on hand. These MOOSE RACING valve shims eliminate...09261869- SKU:
- 09261869
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.75 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.80 - 5 pack MSE5PK748180
MOOSE RACING
$10.95Maintaining proper valve clearance is critical for engine performance, longevity, and reliability—and having the right shims on hand eliminates downtime during valve train service. MOOSE Racing valve...09261870- SKU:
- 09261870
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 1.80 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.85 - 5 pack MSE5PK748185
MOOSE RACING
$10.95Maintaining precise valve clearances is critical to engine performance and longevity—even a few thousandths of an inch off tolerance can cost you horsepower and reliability. The MOOSE RACING Valve...09261871- SKU:
- 09261871
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.85 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 2.40 - 5 pack MSE5PK748240
MOOSE RACING
$10.95Valve shim maintenance doesn't have to mean hunting through unmarked hardware. These MOOSE RACING shims eliminate guesswork with laser-etched sizing, so you can quickly identify the right spec and...09261882- SKU:
- 09261882
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.40 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 2.45 - 5 pack MSE5PK748245
MOOSE RACING
$10.95Maintaining precise valve clearances is critical for consistent performance and engine longevity—and these MOOSE RACING shims give you the durability and accuracy to dial in your valve train without...09261883- SKU:
- 09261883
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.45 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 2.50 - 5 pack MSE5PK748250
MOOSE RACING
$10.95Maintaining proper valve clearance is critical to engine performance, reliability, and longevity—and having quality shims on hand ensures you can make adjustments without delays or compromises. MOOSE...09261884- SKU:
- 09261884
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- VALVE SHIM THICKNESS METRIC:
- 2.50 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$10.95 -
MOOSE RACING Valve Shim - 8.90 x 1.82 - 5 pack MSE5PK890192
MOOSE RACING
$10.95Precision valve shim selection is critical to maintaining proper valve clearance and preventing costly engine damage. This 5-pack of forged 4140 steel shims gives you the exact sizing options needed...09261910- SKU:
- 09261910
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.92 MM
$10.95 -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811427
MOOSE RACING
$92.89A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—OEM-quality components at a fraction of dealership pricing. This MOOSE RACING kit...M811427- SKU:
- M811427
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$92.89 -
MOOSE RACING Water Pump Rebuild Kit 821213
MOOSE RACING
$38.48A failing water pump can sideline your engine and compromise cooling system integrity—this MOOSE RACING rebuild kit gives you everything needed to restore your pump to OEM specifications without...09345179- SKU:
- 09345179
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$38.48 -
MOOSE RACING Water Pump Rebuild Kit 821233
MOOSE RACING
$53.09A failing water pump can compromise your entire cooling system, leaving you stranded trackside or worse. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and O-ring needed to...09345181- SKU:
- 09345181
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$53.09 -
MOOSE RACING Water Pump Rebuild Kit 821243
MOOSE RACING
$52.37A failing water pump doesn't just reduce cooling efficiency—it can cause catastrophic engine damage in minutes. This MOOSE RACING rebuild kit gives you all the OEM-quality components needed to...09345182- SKU:
- 09345182
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$52.37 -
MOOSE RACING Water Pump Rebuild Kit 821259
MOOSE RACING
$40.88A failing water pump can sideline your engine and compromise cooling system integrity—exactly what you can't afford during competition or demanding track sessions. This MOOSE RACING rebuild kit gives...09345184- SKU:
- 09345184
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$40.88 -
MOOSE RACING Motor Gasket Kit with Seal - KTM360/380 811307
MOOSE RACING
$92.89A complete engine and transmission rebuild demands gaskets and seals that fit precisely and last through countless heat cycles. The MOOSE RACING Motor Gasket Kit eliminates the frustration of...09340110- SKU:
- 09340110
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$92.89 -
MOOSE RACING Motor Seals - RM85 822176
MOOSE RACING
$30.56Engine rebuild projects demand reliability at every seal and gasket—compromised seals lead to oil leaks, contamination, and premature failure. The MOOSE RACING Motor Seals kit eliminates the...M822176- SKU:
- M822176
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$30.56 -
MOOSE RACING Motor Seals - CRF450 822178
MOOSE RACING
$59.71Engine and transmission seals are critical wear items that demand precision and reliability—especially when you're rebuilding or maintaining high-performance equipment. MOOSE RACING Motor Seals...M822178- SKU:
- M822178
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- UNITS:
- SET
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
$59.71 -
MOOSE RACING Complete Motor Gasket Kit - CR500 808273
MOOSE RACING
$81.27A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise reliability or performance. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration...M808273- SKU:
- M808273
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$81.27
